The article discusses the state of the quality of early diagnosis of breast cancer. Advances in clinical oncology show that early diagnosis of pre-tumor diseases and initial stages of cancer is possible only with an active search for patients among practically healthy people. The effectiveness of early diagnosis of malignant neoplasms is influenced by many factors, including the biological and clinical features of the tumor process, the sensitivity and specificity of screening methods , the degree of screening coverage of the female population, the frequency of screening and others.